package com;

import org.apache.poi.ss.SpreadsheetVersion;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.ss.util.AreaReference;
import org.apache.poi.ss.util.CellRangeAddress;
import org.apache.poi.ss.util.CellReference;

public class ExcelUtil {

    public static Integer getRowNum(Workbook wb, String diyCellName) {
        int namedCellIdx = wb.getNameIndex(diyCellName);
        Name aNamedCell = wb.getNameAt(namedCellIdx);

        AreaReference[] arefs = AreaReference.generateContiguous(SpreadsheetVersion.EXCEL2007, aNamedCell.getRefersToFormula());
        for (int i = 0; i < arefs.length; i++) {
            CellReference[] crefs = arefs[i].getAllReferencedCells();
            for (int j = 0; j < crefs.length; j++) {
                Sheet s = wb.getSheet(crefs[j].getSheetName());
                Row r = s.getRow(crefs[j].getRow());
                return r.getRowNum();
            }
        }
        return 0;
    }

    /**
     * 获取单元格的值
     *
     * @param cell
     * @return
     */
    public static String getCellValue(Cell cell) {
        if (cell == null) return "";
        return cell.getStringCellValue();
    }

    /**
     * 获取合并单元格的值
     *
     * @param sheet
     * @param row
     * @param column
     * @return
     */
    public static String getMergedRegionValue(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();

        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress ca = sheet.getMergedRegion(i);
            int firstColumn = ca.getFirstColumn();
            int lastColumn = ca.getLastColumn();
            int firstRow = ca.getFirstRow();
            int lastRow = ca.getLastRow();

            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    Row fRow = sheet.getRow(firstRow);
                    Cell fCell = fRow.getCell(firstColumn);
                    return getCellValue(fCell);
                }
            }
        }

        return null;
    }


    /**
     * 判断指定的单元格是否是合并单元格
     *
     * @param sheet
     * @param row    行下标
     * @param column 列下标
     * @return
     */
    public static boolean isMergedRegion(Sheet sheet, int row, int column) {
        int sheetMergeCount = sheet.getNumMergedRegions();
        for (int i = 0; i < sheetMergeCount; i++) {
            CellRangeAddress range = sheet.getMergedRegion(i);
            int firstColumn = range.getFirstColumn();
            int lastColumn = range.getLastColumn();
            int firstRow = range.getFirstRow();
            int lastRow = range.getLastRow();
            if (row >= firstRow && row <= lastRow) {
                if (column >= firstColumn && column <= lastColumn) {
                    return true;
                }
            }
        }
        return false;
    }
}
